Clock



FIG. 1 is a perspective view of a clock;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The relative positions of the three hands of the clock form no part of the claimed design. The illustrated positions of the hands are intended to be representative of numerous possible relative hand positions. 

The ornamental design for a clock, as shown and described. 